Polyazo dye and process of making same.



RUDOL}? HAUQWITZ, OF FBIEDRICHSHAGEN, NEAR BERLIN, GERMANY, ASSIGNOR TO ACTIEN GESELLSCHAFT Ffi'R ANILIN EABRIKA'IION OF BERLIN.

POLYAZO DYE AND PROCESS OF MAKING SAME.

tetrazotized para-diamino compound with one molecular proportion of l-amino-S-naphthol- 2.4-d1sulfon1c acid and one molecular proportion of. a meta-dia'min of the benzene series. The dyes thus manufactured produce on cotton directly blue tints, by subsequent treatment with 4'-ni.trodiazobenzene passing to full bluish-black tints, which can be dis charged to a pure white.

The following example illustrates my invention, the parts being by weight: 13 parts of 4 aminobenzene azo 3 amino 4 cresolmethylether are tetrazotized in the usual manner by means of 32 parts of hydrochloric acid of 20 Baum specific gravity at about 5? C. Into the tetrazo solution thus obtained a solution of 15.5 parts of 1-amino-8-naplrthol-2.4-disulfonic acid, 3 parts of sodium carbonate and 25'parts of sodium acetate is flown. The intermediate product formed at once is mixed with a solution of 6 parts of meta-phenylenediamin and 26 partsof sodium carbonate. After stirring for several hours the mass is heated to about C. and

V the dyestufi salted out, filtered 0E and dried.

The new dye as above obtained forms in the dry and pulverized shape an olive-black powder, soluble in hot water to a blue solution, assuming a violet coloration on addition or" an acid. In concentrated sulfuric acid the dye dissolves to a blue solution,-

which on the addition of ice separates blue flakes of the unaltered dye. By reduction the new dye is split oii', yielding lA-diaminobenz'ene, 2.5-diamino-4e-cresolmethylether,

Specification of Letters Patent.

Application filed April 6, 1911. Serial No. 619,334.

replaced Patented Aug. 1, 1911,

in the above example other para-diamino' compounds, such as dianisidin, may be employed. The meta-phenylenediamin may be by the meta-toluylenediamin, chloro-meta phenylenediamin and the like.

Having now described my invention and the manner in which it What I claim is,

1. As new articles of manufacture the herein-described newpolyazo-dyes dyeing cotton directly blue shades, passing to full bluish-black by treatment with, c-xflltI'OdltLZO- benzene on the fiber, which new dyes may be obtained by combining one molecular proportion of a tetrazotized para-diamino compound with one molecular proportion of 1- ar; .ino-8-naphthol-2.4-disulfonic acid and one may be performed,

molecular proportion of a metadiamin of the benzene series, these new dyes being in the dry and pulverized shape olive-black powders, soluble in hot water with blue color, which turns to violet on the addition of an acid, and soluble in concentrated sulfuric acid to blue solutions, which on the addition of ice separate blue flakes of the unaltered, dye, being split off by reduction, and yielding a triamin of the benzene series, 1.7- diamino-S-naphthol-2.4-disulfonic acid and if the dye was made from a para-diamino compound, unalterable by reduction, this diamino compound, in the other case the reduction products of this para-diamino com pound. i

2. The herein-described new polyazo-dye dyeing cotton directly blue shades, passing to full bluish-black by treatment with 4:- nitrodiazobenzene on the fiber, which new dye may be obtained by combining one molecular proportion of the tetrazotized -aminobenzene azo 3 amino -4. cresolmethylcther with one molecular proportion of l-amino-S- naphthol-Z i-disulfonic'acid and one molecular proportion of a meta-diamin of the benzene series, this new dye being in the dry and pulverized shape an olive-black powder, soluble in hot water with blue color, which turns to violet on the'addition of an acid,

and soluble in concentrated sulfuric acid to a blue asolutimx, which on the addition of my hand in presence of two subscribing witice separates blue flakes of the unaltered dye, messes. bging split off by reduction, and yielding L diaminobenzene, 2.5 diamino 4 cresol- 5 methyiether, LQA-triaminobenzene and 1.7- Wi-tpesses:

diamino-8-naphth0l-2. c-disulfanic acid. A HENRY HASPER,

In testimony whereof 1 have hereunto set I W'OLDEMAR HAUPT.

RUDOLF HAUGW TZ. 

